KR20060059367A - Speaker - Google Patents

Abstract

 The present invention relates to a speaker, in accordance with the present invention, is provided on a columnar first magnet, an axis coaxial with a central axis of the first magnet to provide a repulsive magnetic flux that repels the magnetic flux generated in the first magnet. A magnetic circuit device including a second magnet and an insulator separating the first magnet and the second magnet to form a magnetic field in a predetermined vibration space; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; And a diaphragm connected to the voice coil to generate sound pressure by vibrating with the voice coil; and a frame supporting the respective devices, wherein the first magnet of the magnetic circuit device is positioned in front of the diaphragm. By doing so, it relates to a technology that can implement a thin plate-type speaker with high efficiency.

Speaker, diaphragm, damper, magnetic circuit device, magnet

Description

Speaker {Speaker}

1 is an exploded perspective view of a speaker according to the prior art.

2 is a sectional view of the speaker of FIG.

3 is an exploded perspective view of a speaker according to an exemplary embodiment of the present invention.

4 is a cutaway perspective view of the speaker of FIG.

FIG. 5 is a schematic diagram showing a magnetic path in the magnetic circuit device of the speaker of FIG.

6 is a cross-sectional view of a speaker according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

 300: speaker 301: frame

301a: side plate 301b: thick plate

301c: installation space 302: magnetic circuit device

302a: first magnet 302b: insulator

302c: shear plate 302d: side plate

303: bobbin 304: voice coil

305: diaphragm 306: damper

307: second magnet 308: edge surround

309: dust cap 310: support

605: first magnet 610: insulator

615: second magnet 620: magnetic circuit device

625: lower plate 630: side plate

635: upper plate 640: bobbin

645: voice coil 650: damper

655: diaphragm 660: frame

The present invention relates to a loudspeaker, and more particularly, to a mechanical configuration for implementing a thin-walled speaker having a short overall length and high efficiency.

A speaker is an apparatus for reproducing an electrical signal as a sound, and a conventional speaker is disclosed in a number of public documents including Korean Utility Model Publication No. 2000-0005319.

1 is an exploded perspective view of such a conventional speaker 100, and FIG. 2 is a sectional view of the speaker 100 of FIG. Referring to this, the speaker 100 according to the related art includes a trumpet-shaped frame 11 for supporting each device, and a cone-shaped diaphragm having a hollow and vibrating inside the frame 11. (12), an edge surround (13) for elastically supporting the front end of the diaphragm 12 at the front end of the frame 11, and the front end side at the rear side of the diaphragm 12 is the diaphragm ( The bobbin 14 is fixed to the central portion of 12), the outer circumference is fixedly supported by the frame 11 and the inner circumference is a damper (15, damper) fixed to the bobbin 14, and the bobbin 14 A voice coil 16 wound around the donut-shaped permanent magnet 17 disposed outside the voice coil 16, and a donut shape fixedly disposed between the frame 11 and the permanent magnet 17. The upper plate 18, the lower plate 19 covering the lower portion of the permanent magnet 17, the permanent magnet 17 and A pole piece 20 and a speaker provided to protrude from the lower plate 19 to the inside of the bobbin 14 with a vibration space 22 in which the bobbin 14 vibrates up and down between the sub plate 18. 100 is configured to include a dust cap 21 to block the interior from the outside dust and to maintain the shape of the diaphragm 12.

When the speaker 100 receives a voice electric signal from the amplifier (not shown) to the voice coil 16, the voice coil 16 generates magnetic flux according to the voice electric signal, and the voice coil 16 The magnetic coil is generated between the magnetic flux generated by the magnetic field and the magnetic field formed in the vibration space by the magnetic circuit device consisting of the permanent magnet 17, the upper and lower plates (18, 19) and the pole piece (20) 16 receives a magnetic force corresponding to the voice electric signal, and when the bobbin 14 vibrates by the magnetic force, the diaphragm 12 vibrates along with the bobbin 14 to vibrate the air in front of the sound to generate sound. do. On the other hand, the edge surround 13 and the damper 15 provides a restoring force during the vibration of the bobbin 14 and the diaphragm 12, in particular, the damper 15 is to bounce up and down bobbin 14 and the diaphragm It provides the restoring force necessary for the reciprocating motion of (12).

 However, the conventional speaker 100 as described above is provided with a permanent magnet 17, upper and lower plates 18 and 19 and the pole piece 20 forming a magnetic circuit device to secure a separate space on the rear side of the frame. Therefore, the overall length of the speaker was inevitably long, and therefore, there was a problem that it was difficult to produce a thin speaker having a short length.

In order to solve this problem, the present applicant places a magnetic circuit device in an installation space formed by a side plate forming a side and a rear plate forming a rear surface through the Korean Patent Application 10-2004-0043857, and the magnetic circuit device is placed in front of the diaphragm. It has been disclosed a technology that can produce a thin plate-shaped speaker with a short length by characterized in that it is installed in. However, in applying the above technique to a small speaker, as the magnet is small, there is a possibility that the magnetic field strength formed on the vibration space in which the voice coil vibrates may be weak.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a speaker in which each configuration such as a magnetic circuit device for realizing the function of the speaker has a spatial arrangement suitable for the manufacture of a thin speaker, and also provides a predetermined vibration space. It is an object of the present invention to provide an improved technique for improving the efficiency of a speaker by increasing the magnetic field strength on the phase.

The speaker according to the present invention for achieving the above object is provided on the axis of the columnar coaxial with the first magnet, the central axis of the first magnet is a repulsive magnetic flux that repels the magnetic flux generated in the first magnet A magnetic circuit device including a second magnet to provide and an insulator separating the first magnet from the second magnet to form a magnetic field in a predetermined vibration space; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; And a diaphragm connected to the voice coil to generate a sound pressure by vibrating with the voice coil; and a frame supporting the respective devices.

The first magnet of the magnetic circuit device is characterized in that more specifically located in front of the diaphragm.

In addition, the speaker according to the present invention for achieving the above object, is installed on the axis of the column-like first magnet, the central axis of the first magnet and the repulsion to the magnetic flux generated in the first magnet A magnetic circuit device including a second magnet providing magnetic flux and an insulator separating the first and second magnets to form a magnetic field in a predetermined vibration space; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; And a diaphragm connected to the bobbin to generate a sound pressure by vibrating with the bobbin; and a frame supporting the respective devices.

The first magnet of the magnetic circuit device is characterized in that more specifically located in front of the bobbin.

In addition, the speaker according to the present invention for achieving the above object, is installed on the axis of the column-like first magnet, the central axis of the first magnet and the repulsion to the magnetic flux generated in the first magnet A magnetic circuit device including a second magnet providing magnetic flux and an insulator separating the first and second magnets to form a magnetic field in a predetermined vibration space; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; A diaphragm connected with the bobbin to generate a sound pressure by vibrating with the bobbin; One side is connected to the bobbin and the other side is connected to the frame damper to suppress the over-movement of the bobbin; and a frame for supporting each device; characterized in that it comprises a.

The first magnet of the magnetic circuit device is characterized in that more specifically located in front of the damper.

In addition, the speaker according to the present invention for achieving the above object, the frame having an inner installation space formed by the side plate and the rear plate forming a side; A magnetic circuit device positioned on an installation space of the frame and including a first magnet and an insulator to form a magnetic field in a predetermined vibration space; A second magnet attached to a rear end surface of the insulator, which provides a repulsive magnetic flux that repels the magnetic flux generated in the first magnet of the magnetic circuit device; A voice coil which vibrates on the predetermined vibration space by generating magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal; and connected to the voice coil together with the voice coil. It characterized in that it comprises a; diaphragm for generating a sound pressure by vibrating.

In addition, the speaker according to the present invention for achieving the above object, the frame having an inner installation space formed by the side plate and the rear plate forming a side; A magnetic circuit device positioned on an installation space of the frame and including a first magnet and an insulator to form a magnetic field in a predetermined vibration space; A second magnet attached to a rear end surface of the insulator, which provides a repulsive magnetic flux that repels the magnetic flux generated in the first magnet of the magnetic circuit device; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; And a diaphragm connected to the bobbin to generate sound pressure by vibrating with the bobbin.

 In addition, the speaker according to the present invention for achieving the above object, the frame having an inner installation space formed by the side plate and the rear plate forming a side; A magnetic circuit device positioned on an installation space of the frame and including a first magnet and an insulator to form a magnetic field in a predetermined vibration space; A second magnet attached to a rear end surface of the insulator, which provides a repulsive magnetic flux that repels the magnetic flux generated in the first magnet of the magnetic circuit device; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; And a vibration plate connected to the bobbin to generate a sound pressure by vibrating together with the bobbin; and a damper connected to the bobbin and the other side connected to the frame to suppress over-movement of the bobbin. It is another feature.

In addition, the speaker according to the invention, characterized in that it further comprises a magnetic body portion for inducing magnetic flux generated by the magnetic circuit device.

The magnetic body portion, the shear surface plate is fixed to the front end surface of the first magnet; And

It is attached to the outer circumferential lower (lower) surface of the shear surface plate to surround the first magnet; characterized in that it comprises a more specific feature.

In addition, the insulator constituting the speaker according to the present invention has a more specific feature of being a magnetic body.

In addition, the speaker according to the present invention, the support is fixed to the frame for supporting the magnetic circuit device; characterized in that it further comprises.

The support viewed from another side may be a support fixed to the frame to form a hollow supporting the insulator, in which case the second magnet is inserted into the hollow of the support so that It is characterized in that it is attached to the cross section.

Hereinafter, with reference to the accompanying drawings for a preferred embodiment according to the present invention will be described in more detail.

First Embodiment

3 is an exploded perspective view of a speaker 300 according to an embodiment of the present invention, Figure 4 is a cutaway perspective view of the speaker 300 of FIG.

3 and 4, the speaker 300 according to the present embodiment includes a frame having an inner installation space 301c formed by a side plate 301a forming a side surface and a rear plate 301b forming a rear surface thereof. The magnetic circuit device 302 is formed on the installation space 301c of the frame and includes a first magnet 302a and an insulator 302b having a columnar shape to form a magnetic field in a predetermined vibration space 302e. And a magnetic body part for inducing magnetic flux generated by the magnetic circuit device 302 and an axis coaxial with a central axis of the first magnet 302a of the magnetic circuit device 302. Attached to the rear end surface of the insulator 302b, which strongly repels the magnetic flux generated in the first magnet 302a by providing a repulsive magnetic flux that repels the magnetic flux generated in the 302a). The second magnet 307 and the predetermined vibration space 302e of the magnetic circuit device 302. The voice coil 304 which generates magnetic flux interfering with the magnetic field formed in the external device according to an external input electric signal and vibrates on the predetermined vibration space 302e, and is wound by the voice coil 304 and the voice coil 304. And vibrating with the bobbin 303, the diaphragm 305 is connected to the bobbin 303 and vibrates with the bobbin 303 to generate a sound pressure, one side is connected to the bobbin 303 and the other side is And a damper 306 connected to the frame to suppress over-movement of the bobbin 303, and a support 310 fixed to the frame to support the separator 302b. .

Each configuration according to the present embodiment as described above will be described in more detail below.

The frame is a bowl shape extended forwardly, and the inner space thereof may be defined as an installation space 301c in which each device for realizing the function of the speaker is supported while being supported by the frame. Since the sound spreads, it is possible to define the lateral direction in which the expanded opening is front and the opposite direction in the rear. Therefore, in the present application, the inner space formed by the side plate 301a constituting the side and the rear plate 301b constituting the rear side is defined as the installation space 301c, the direction in which the sound spreads forward, and the opposite direction to the rear define.

The magnetic circuit device 302 is installed to be supported by a support 310 having a cylindrical non-magnetic material having a hollow having a predetermined height fixed to the rear plate 301b of the frame, and the magnetic circuit device 302. The first magnet 302a constituting) is provided to correspond to the second magnet 307 with the insulator 302b interposed therebetween (the central axes of the first magnet 302a and the second magnet 307 are coaxial). This is most preferred). In this case, if the part attached to the separator 302b of the first magnet 302a is the N pole, the part attached to the separator 302b of the second magnet 307 is also configured to be the N pole. That is, the first magnet 302a and the second magnet 307 are configured to be the same pole between the insulator 302b, thereby to generate the magnetic flux generated on the insulator 302b by the first magnet 302a. Push it outwards strongly. Here, the first magnet may provide a symmetrical magnetic flux by having a columnar shape, but most preferably, the first magnet may provide an optimal symmetrical magnetic flux by having a cylindrical shape.

On the other hand, a magnetic body portion for inducing a magnetic flux generated by the magnetic circuit device 302 to form a predetermined vibration space 302e is provided to the outside of the magnetic circuit device 302, the magnetic body portion is A disk-shaped shear face plate 302c directly fixed to the shear face of the first magnet 302a and a side plate 302d provided in a cylindrical shape toward the outer circumferential rear side of the shear face plate. The side plate 302d surrounds the side surface of the first magnet 302a at a predetermined interval, and is a space formed with a predetermined distance between the side plate 302d and the side surface of the first magnet 302a. The bobbin 303 or the voice coil 304 is a vibrating space 302e which vibrates. FIG. 5 is a cross-sectional view showing a magnetic path formed by the magnetic circuit device 302, the second magnet 307, and the magnetic body portion. Referring to FIG. 5, the magnetic flux generated at the N pole of the first magnet 302a is strongly pushed outwards against the magnetic flux generated at the N pole of the second magnet 307, and the magnetic flux is side plate 302d of the magnetic body portion. And a strong magnetic field in the predetermined vibration space 302e between the side plate 302d and the first magnet 302a.

The bobbin 303 is cylindrical and has a diameter larger than the diameter of the first magnet 302a, and is provided to have a diameter smaller than that of the side plate 302d, and the bobbin 303 is the vibration space 302e. Vibrate in the forward and backward directions.

The voice coil 304 is wound around the bobbin 303, receives a voice electric signal from an amplifier not shown, and generates a magnetic flux corresponding to the voice electric signal. At this time, since the voice electric signal that is continuously changed from the amplifier is input, the magnetic flux generated in the voice coil 304 is constantly changed, and accordingly the magnetic circuit device 302 is constantly on the vibration space 302e. Magnetic interference between the formed magnetic field and the changing magnetic flux generated in the voice coil 304 causes the bobbin 303 to vibrate. In this embodiment, the voice coil 304 is wound around the bobbin 303 and the bobbin 303 vibrates, but the bobbin 303 is not an essential configuration. In a small speaker such as a micro speaker, it is possible to omit the bobbin 303, in which case the rear end of the voice coil 304 is directly connected to the diaphragm 305 to be described later and vibrates in the vibration space 302e. Sound pressure can be generated at 305.

The diaphragm 305 is a cone shape extended forward and has a hollow on a central axis. The rear end of the bobbin 303 or the rear end of the voice coil 304 is fixed around the hollow. Therefore, as shown in FIG. 4, the outer circumference of the diaphragm 305 is fixedly supported at the front end of the side plate 301a of the frame, and the inner circumference of the diaphragm 305 is the rear end or the voice coil 304 of the bobbin 303. Since it is directly attached to the rear end of the), as the bobbin 303 or the voice coil 304 vibrates, the diaphragm 305 also vibrates together. In the present embodiment, as shown in FIG. 4, the first magnet 302a of the magnetic circuit device 302 is positioned in front of the diaphragm 305 to realize a thin plate-shaped speaker having a short length.

On the other hand, the damper 306 serves a variety of roles, but also provides a restoring force for suppressing over-vibration of the diaphragm 305 and the bobbin 303, and also suppresses the shaking of the bobbin 303. There are various types of dampers 306, and the general type of dampers 306 is a disk shape having a hollow when viewed from the top, as shown in Figs. It is fixedly supported by 301a, and the inner periphery is fixed to the rear end of the bobbin 303. In the present embodiment, as shown in FIG. 4, the first magnet 302a of the magnetic circuit device 302 is positioned in front of the damper 306 in order to realize a thin plate-shaped speaker having a short length. The damper 306 is not an essential configuration, and may be omitted in a small speaker such as a micro speaker.

The rear plate 301b forms a hollow about a central axis, and the cylindrical support 310 protrudes toward the front of the hollow so that the front end of the support 310 is the magnetic circuit device 302, In particular, the magnetic circuit device 302 is firmly positioned by supporting the isolator 302b. On the other hand, the second magnet 307 is inserted into the hollow (which is also the hollow of the rear plate 301b) of the support 310 is attached to the rear end surface of the separator 302b is the first magnet 302a Will provide a repulsive flux to the magnetic flux generated in

The configuration shown by reference numeral 309 is a dust cap 309 that blocks the magnetic circuit device 302 from foreign matter and also supports the diaphragm 305. The dust cap 309 can also be omitted in small speakers and the like.

In the present embodiment, the first magnet 302a and the separator 302b are represented as the magnetic circuit device 302 and the second magnet 307 is described as providing the repulsive magnetic flux. However, the first magnet 302a Even though the insulator 302b and the second magnet 307 are included, the magnetic circuit device 302 may be represented, and the magnetic circuit device 302 may form a magnetic field in the vibration space 302e. Of course, it will be included in the technical idea of the present invention.

On the other hand, the frame consisting of the side plate (301a) and the thick plate (301b) will ultimately serve to support the respective devices.

The operation of the speaker according to the present embodiment having the above configuration will be described with reference to FIG.

The magnetic flux generated in the first magnet 302a is strongly pushed to the outside of the separator 302b under the influence of the repulsive magnetic flux of the second magnet 307, and the magnetic flux pushed to the outside is the side plate 302d. ) And isolator 302c and converge back to the opposite pole of the first magnet 302a. As a result, a constant magnetic field is formed in the vibration space 302e formed between the side plate 302d and the first magnet 302a.

On the other hand, when a voice electric signal that changes over time is input to the voice coil 304 from an amplifier not shown, the voice coil 304 generates a varying magnetic flux corresponding to the voice voice signal that changes. The magnetic flux thus changed is mutually magnetically interfered with the magnetic field uniformly formed in the vibration space 302e, and the voice coil 304 receives the force in the front-rear direction by such magnetic interference. If the voice coil 304 is wound around the bobbin 303, the bobbin 303 also vibrates in the front and rear direction as the voice coil 304 vibrates, and is fixed to the rear end of the bobbin 303 by the vibration. The vibrating diaphragm 305 is vibrated, and the vibration of the vibrating diaphragm 305 vibrates air in the space in front of the diaphragm 305 to generate sound pressure, so that the voice electric signal is ultimately converted into mechanical sound. . However, as described above, the rear end of the voice coil 304 may be directly connected to the diaphragm 305 while the bobbin 303 is omitted to generate sound pressure on the diaphragm 305.

On the other hand, the damper 306 supports the rear end of the bobbin 303 while suppressing excessive vibration of the bobbin 303 or vibration in the lateral direction.

Second Embodiment

6 is a cross-sectional view of a speaker according to another embodiment of the present invention. Referring to FIG. 6, the speaker according to the present exemplary embodiment is installed on a shaft coaxial with a central axis of the column-shaped first magnet 605 and the first magnet 605, so that the first magnet 605 is separated from the first magnet 605. It comprises a second magnet 615 for providing a repulsive magnetic flux to the magnetic flux generated and an insulator 610 that isolates the first magnet 605 and the second magnet 615 to a predetermined vibration space Magnetic circuit device 620 to form a magnetic field, the upper plate 635, the lower plate 625 and the side plate 630 consists of a magnetic body to induce the magnetic flux generated by the magnetic circuit device 620, The voice coil 645 and the voice coil 645 which generate magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device 620 according to an external input electric signal and vibrate on the predetermined vibration space. The bobbin (6) which is wound by the vibration coil together with the voice coil 645 40 and the diaphragm 655 connected to the bobbin 640 to generate a sound pressure by vibrating together with the bobbin 640, one side is connected to the bobbin 640 and the other side is connected to the frame 660 And a damper 650 for suppressing over-movement of the bobbin 640 and a frame 660 for supporting each device.

According to this embodiment, the operation of the sound pressure generated in the diaphragm 655 will be described with reference to FIG.

The magnetic flux generated at the north pole of the first magnet 605 is strongly pushed to the outside of the insulator 610 under the influence of the repulsive magnetic flux of the second magnet 615, the magnetic flux pushed outward is The plate 635 is guided to the side plate 630 and eventually converges to the S pole of the first magnet 605. In addition, the magnetic flux generated at the north pole of the second magnetic flux is strongly pushed to the outside of the separator 610 under the influence of the repulsive magnetic flux of the first magnet 605, the magnetic flux pushed to the outside is the upper plate 635, the side plate 630 and the lower plate 625 are guided back to the S pole of the second magnet 615. As a result, a constant magnetic field is formed in the vibration space formed between the side plate 630, the first magnet 605, and the second magnet 615.

On the other hand, when a voice electric signal that changes over time is input from the amplifier not shown to the voice coil 645, the voice coil 645 generates a varying magnetic flux corresponding to the changed voice electric signal. The magnetic flux thus changing causes mutual magnetic interference with a magnetic field uniformly formed in the vibration space, and the voice coil 645 receives a force in the front and rear directions by such magnetic interference. If the voice coil 645 is wound around the bobbin 640, the bobbin 640 also vibrates in the front-rear direction as the voice coil 645 vibrates, and is fixed to the rear end of the bobbin 640 by the vibration. The vibration plate 655 vibrates, and the vibration of the vibration plate 655 vibrates the air in the space in front of the vibration plate 655 to generate sound pressure, so that the voice electric signal is ultimately converted into a mechanical sound. .

However, in the present embodiment, unlike the first embodiment, since the first magnet 605 is installed at the rear of the diaphragm 655, it is difficult to implement a thin plate speaker.

 As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings, FIGS. 3 to 6, but the above-described embodiments have only been described with reference to preferred examples of the present invention. One of ordinary skill in the art can easily implement the present invention in other forms within the same scope as the above embodiments, or in the same range as the present invention, only by the description of the embodiments of the present invention. Therefore, the present invention should not be construed as being limited only to the above embodiments, and the scope of the present invention should be construed to extend to the full range of applications and modifications within the basic technical spirit of the present invention.

As described above, according to the present invention, since the magnetic circuit device is disposed on the installation space of the frame, unlike the conventional method, a separate space for constituting the magnetic circuit device is not required, thereby implementing a thin-shaped speaker having a short length. In addition, by adopting a mechanical configuration in which the second magnetic flux provides a repulsive magnetic flux that repels the magnetic flux generated in the first magnet of the magnetic circuit device, the magnetic field strength is increased in the vibration space where the voice coil or bobbin vibrates. It can increase the efficiency of the speaker.

Claims (14)

A first magnet having a columnar shape, a second magnet provided on an axis coaxial with a central axis of the first magnet and providing a repulsive magnetic flux that repels the magnetic flux generated by the first magnet, and the first magnet and the second magnet. A magnetic circuit device configured to include an insulator to isolate the magnetic field to form a magnetic field in a predetermined vibration space; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A vibration plate connected to the voice coil to generate a sound pressure by vibrating with the voice coil; and And a frame for supporting each device. The method of claim 1, And the first magnet of the magnetic circuit device is located in front of the diaphragm. A first magnet having a columnar shape, a second magnet provided on an axis coaxial with a central axis of the first magnet and providing a repulsive magnetic flux that repels the magnetic flux generated by the first magnet, and the first magnet and the second magnet. A magnetic circuit device configured to include an insulator to isolate the magnetic field to form a magnetic field in a predetermined vibration space; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; A diaphragm connected with the bobbin to generate sound pressure by vibrating with the bobbin; and And a frame for supporting each device. The method of claim 3, And a first magnet of the magnetic circuit device is located in front of the bobbin. A first magnet having a columnar shape, a second magnet provided on an axis coaxial with a central axis of the first magnet and providing a repulsive magnetic flux that repels the magnetic flux generated by the first magnet, and the first magnet and the second magnet. A magnetic circuit device configured to include an insulator to isolate the magnetic field to form a magnetic field in a predetermined vibration space; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; A diaphragm connected with the bobbin to generate a sound pressure by vibrating with the bobbin; One side is connected to the bobbin and the other side is connected to the frame damper to suppress the over-movement of the bobbin; And And a frame for supporting each device. The method of claim 5, And the first magnet of the magnetic circuit device is located in front of the damper. A frame having an inner installation space formed by a rear plate forming a side and a rear plate forming a rear surface; A magnetic circuit device positioned on an installation space of the frame and including a first magnet and an insulator to form a magnetic field in a predetermined vibration space; A second magnet attached to a rear end surface of the insulator, which provides a repulsive magnetic flux that repels the magnetic flux generated in the first magnet of the magnetic circuit device; A voice coil which vibrates on the predetermined vibration space by generating magnetic fluxes interfering with the magnetic field formed on the predetermined vibration space of the magnetic circuit device according to an external input electric signal; and And a diaphragm connected to the voice coil to generate a sound pressure by vibrating with the voice coil. A frame having an inner installation space formed by a side plate forming a side and a rear plate forming a rear surface; A magnetic circuit device positioned on an installation space of the frame and including a first magnet and an insulator to form a magnetic field in a predetermined vibration space; A second magnet attached to a rear end surface of the insulator, which provides a repulsive magnetic flux that repels the magnetic flux generated in the first magnet of the magnetic circuit device; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; And a diaphragm connected to the bobbin to generate sound pressure by vibrating with the bobbin. A frame having an inner installation space formed by a side plate forming a side and a rear plate forming a rear surface; A magnetic circuit device positioned on an installation space of the frame and including a first magnet and an insulator to form a magnetic field in a predetermined vibration space; A second magnet attached to a rear end surface of the insulator, which provides a repulsive magnetic flux that repels the magnetic flux generated in the first magnet of the magnetic circuit device; A voice coil which generates magnetic fluxes interfering with a magnetic field formed on a predetermined vibration space of the magnetic circuit device according to an external input electric signal and vibrates on the predetermined vibration space; A bobbin wound with the voice coil and vibrating with the voice coil; A diaphragm connected with the bobbin to generate sound pressure by vibrating with the bobbin; and And a damper having one side connected to the bobbin and the other side connected to the frame to suppress over-movement of the bobbin. The method according to any one of claims 1 to 9, And a magnetic body part for inducing magnetic flux generated by the magnetic circuit device. The method of claim 10, The magnetic body portion, Shear surface plate is fixed to the front end surface of the first magnet; And And a side plate attached to an outer circumferential surface of the shear surface plate and surrounding the first magnet. The method according to any one of claims 1 to 9, The insulator is a magnetic body, characterized in that the magnetic body. The method according to any one of claims 1 to 9, And a supporter fixed to the frame to support the magnetic circuit device. The method according to any one of claims 1 to 6, It is further provided with a support is fixed to the frame is formed hollow to support the separator; And the second magnet is inserted into the hollow of the support and attached to a rear end surface of the separator.

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